Improve highlighting structure

- switched to a sparse delta based map
- true lazy-loading to avoid any unneccessary allocations
- fixed windows management api

src/syntax/bash.cc

@@ -10,7 +10,7 @@ struct BashFullState {
   bool line_cont = false;
 
   struct Lit {
-    std::string delim = ""; // Only 1 wide for strings
+    std::string delim = "";
     bool allow_interp = false;
 
     bool operator==(const BashFullState::Lit &other) const {
@@ -24,7 +24,7 @@ struct BashFullState {
   }
 };
 
-struct BashState {
+struct BashState : StateBase {
   using full_state_type = BashFullState;
 
   int interp_level = 0;
@@ -37,26 +37,32 @@ struct BashState {
            ((full_state && other.full_state &&
              *full_state == *other.full_state));
   }
+
+  std::unique_ptr<StateBase> clone() const override {
+    return std::make_unique<BashState>(*this);
+  }
 };
 
-bool bash_state_match(std::shared_ptr<void> state_1,
-                      std::shared_ptr<void> state_2) {
+bool bash_state_match(StateBase *state_1, StateBase *state_2) {
   if (!state_1 || !state_2)
     return false;
-  return *std::static_pointer_cast<BashState>(state_1) ==
-         *std::static_pointer_cast<BashState>(state_2);
+  return *static_cast<BashState *>(state_1) ==
+         *static_cast<BashState *>(state_2);
 }
 
-std::shared_ptr<void> bash_parse(std::vector<Token> *tokens,
-                                 std::shared_ptr<void> in_state,
-                                 const char *text, uint32_t len,
-                                 uint32_t line_num) {
+std::unique_ptr<StateBase> bash_parse(std::vector<Token> *tokens,
+                                      StateBase *in_state, const char *text,
+                                      uint32_t len, uint32_t line_num) {
   static bool keywords_trie_init = false;
   if (!keywords_trie_init) {
     keywords_trie_init = true;
   }
   tokens->clear();
-  auto state = ensure_state(std::static_pointer_cast<BashState>(in_state));
+  std::unique_ptr<BashState> state;
+  if (in_state)
+    state = static_unique_ptr_cast<BashState>(in_state->clone());
+  else
+    state = std::make_unique<BashState>();
   uint32_t i = 0;
   while (len > 0 && (text[len - 1] == '\n' || text[len - 1] == '\r' ||
                      text[len - 1] == '\t' || text[len - 1] == ' '))